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Topic: Hi Im new and i wanna know some things... :) plz help me with that (Read 4051 times)

Hi as i said in topic im new... and i mean it. im new to the whole electronics thing i've beel looking around the whole forum for now and i have some questions...first i wanna know about scavenging stuff...well i have an old computer, about 5 mice several monitors 2 of theese things that poewr the whole computer...(I dont remember its name ) and i eaven have 1 old touchsensitive mobilephone...mby theres something more but i cant remember atm... anyway. what i want to know what can i scavange out of them... can i take something from a computers motherboard? wrom where could i get a microcontroller for my first robot i wanna start making soon and what things have any good electronics in them? as i said i am quite new to the whole electronics, so could you please explain what do the things look like in theese old computers and what ever...OK what else do i wanna know... oh yea...what is "IR sensor" i've read that they are in mouses mostly...but what do they do or what can i do with them? can i use them on my robots?and lastly everybody is talking about some code what is the"code"?? i've seen many pages that allow u to download the robots code... but it doesnt tell me anything so i'd be very grateful if you'd answer my questions :D

PS: i know there is a lot of text i just wrote but yea... plz read it and answer me PSS: just one more question:D ... i have looked for answers for this from this forum but im still confused...what is the h bridge used for and what is it anyway ?

That tutorial is kinda out of date, as I no longer recommend making one. Instead, just buy a motor driver, motor controller, or ESC (whatever you want to call it). They can be fairly cheap ($10-$120), depending on your specs.

well... i looked that motherboard but it doesn't have any LEDs on it but yeah it sure does have a lot of capacitors i have allready read this computer scraping(or whatever ) i didn't hind anything interesting there unfortunately... expert that comps power supply thing... pench-top power supply? what is that? :Dand about that h-bridge... I've read this tut too but yeah..its too complicated for me and these motorcontrollers can anybody tell me when could i scavenge these out or something cuz i live in a little country and i cant buy these things from shop and no page ships anything here too so yeah... thats because I'm mostly a scavenger thanks anyway

yea I'm sorry, just a bad habit..but to admin...yes Estonia is too little and i cant order a thing here from like UK or USA but i still want to know what is The "code" that everybody is talking about and what can i do with IR sensors?

Basically it shoots out a beam of infrared light from its IR transmitter and calculates how much time it took that IR to bounce back to the IR receiver and uses that to determine the distance of the object in front of it.

Also, the standard $50 robot tutorial uses photoresistors as eyes but there is a link at the end of the project to upgrade both the micro controller and also the eyes into IR sensors.

OK i get it... but i read somewhere that there are IR sensors in computer mice too... so looked up a picture http://en.wikipedia.org/wiki/Image:Mouse-mechanism-cutaway.png it says infrared LED.is that the IR sensor? and if it isn't then how can i use these infrared LED's on my robots? just like a normal photoresistor? or do i have to use the other sensor too thats on the mice?

Well those work like this: There 2 bars perpendicular to each other that are turned by the ball as the ball moves. Each bar represents one Y axis and one X axis. These bars are connected to one disc each. This disc has either small holes around its outside edged or teeth around its outside edge. The IR is constantly emitting from an IR LED transmitter and picked up by the IR receiver. The teeth or holes intermittently block and allow the IR to reach the IR receiver. Using the frequency in which the IR beam can be seen and hidden from the receiver determines how fast the user moved the mouse and how far.

Well those work like this: There 2 bars perpendicular to each other that are turned by the ball as the ball moves. Each bar represents one Y axis and one X axis. These bars are connected to one disc each. This disc has either small holes around its outside edged or teeth around its outside edge. The IR is constantly emitting from an IR LED transmitter and picked up by the IR receiver. The teeth or holes intermittently block and allow the IR to reach the IR receiver. Using the frequency in which the IR beam can be seen and hidden from the receiver determines how fast the user moved the mouse and how far.

OK this is the part i understand but still: can i use these IR sensors and receivers in my robots?

Basically it shoots out a beam of infrared light from its IR transmitter and calculates how much time it took that IR to bounce back to the IR receiver and uses that to determine the distance of the object in front of it.

Actually, they don't measure time, they measure angle of the reflected light. The beam is at a slight angle, so the further away the target is, the slightly more shifted the reflected light is when it comes back. There is an array of highly precise sensors that measure this distance. The sensor is also modulated, meaning it is highly resistant to environmental noise. This makes the range go for several feet/meters.http://www.societyofrobots.com/sensors_sharpirrange.shtml

hey...this may be a reeaaalyy stupid question, but is the IR sensor the same that infrared?

I guess you are puzzled with all this abbreviation stuff. IR means Infra-Red, US means Ultra-Sonic, LED means Light Emmiting Diode and so on.Usually something that emits light is not a sensor. A sensor is something that receives or monitors a signal or an environment change. An IR LED is an infrared light emmiter, an IR fotodiode or fototranzistor is a receiver, so this is a sensor. There are active sensors, that emit a certain modulated wave (light or sound) and measure the angle or the time it takes for this wave to get back at the receiver of the sensor. Such sensor is the Sharp IR Distance sensor or the Devantech Ultrasonic Range sensor.

But if you take some time to read all the tutorials on this site, you will understand all this by yourself. Then, if you still don't get part of it, you can ask us. Start with the simple things first. If you start with the wavefront algoritm and you don't know what IR is, you won't understand much.Good luck!